Changeset 3454 for trunk/gsdl3/src/java/org/greenstone/gsdl3/action

Timestamp:

2002-10-11T13:36:37+13:00 (22 years ago)

Author:

kjdon

Message:

now handles GSDL2 style classifications

File:

• trunk/gsdl3/src/java/org/greenstone/gsdl3/action/BrowseAction.java (modified) (3 diffs)

trunk/gsdl3/src/java/org/greenstone/gsdl3/action/BrowseAction.java

@@ -8 +8 @@
 import org.w3c.dom.Element; 
 
+import java.util.HashMap;
+import java.io.File;
 public class BrowseAction extends Action {
     
 
     public String process (Element message) {
+
+    // create the return page tree
+    Element page = doc_.createElement("page");
+    page.setAttribute("lang", message.getAttribute("lang"));
+    // add the lang stuff from message
+    page.appendChild(doc_.importNode(GSXML.getChildByTagName(message, "translate"), true));
+    // add the system stuff from message
+    page.appendChild(doc_.importNode(GSXML.getChildByTagName(message, "config"), true));
 
     Element request = (Element)message.getElementsByTagName("request").item(0);
@@ -20 +30 @@
     String browse_type = GSPath.getFirstLink(info);
     
-    return unknownBrowse(request, browse_type);
+    if (browse_type.equals("classifier")) {
+        return classifierBrowse(page, request);
+    }
+    return unknownBrowse(page, request, browse_type);
 
     
@@ -26 +39 @@
     
 
-    protected String unknownBrowse(Element request, String browse_type) {
+    protected String classifierBrowse(Element page, Element request) {
+
+    // check that the stylesheet is present - cant output a page without one. we may adapt this to use unknownquery stylesheet? - or ask for one from the MR
+    String stylesheet = GSFile.stylesheetFile(config_, "classifier.xsl");
+    if (stylesheet==null) {
+        return GSHTML.errorPage("classifier stylesheet not found!");
+    }
+    Document style_doc = converter_.getDOM(new File(stylesheet));
+
+    // extract the params from the cgi-request, and check that we have a coll specified
+    // first convert short to long names
+    Element cgi_paramList = (Element)GSXML.getChildByTagName(request, "paramList");
+    cgi_.toLong(cgi_paramList);
+    HashMap params = GSXML.extractParams(cgi_paramList);
+
+    String collection = (String)params.get("c");
+    if (collection == null || collection.equals("")) {
+        return GSHTML.errorPage("classifierbrowse, need to specify a collection!");
+    }
+
+    // the first part of the data for the page is the cgi-params
+    Element cgi_request = (Element)doc_.importNode(request, true);
+    page.appendChild(cgi_request);
+
+    // get the service info from the MR - this will probably need to be cached somehow later on. and add as a description node to the cgi-request - this doesn't work. change to add the specified value as a current attribute to the param - need to do somthing different for query
+
+    Element mr_info_message = doc_.createElement("message");
+    Element mr_info_request = doc_.createElement("request");
+    mr_info_message.appendChild(mr_info_request);
+    mr_info_request.setAttribute("type", "describe");
+
+    String to = collection;
+    to = GSPath.appendLink(to, "ClassifierBrowse");
+    mr_info_request.setAttribute("to", to);
+
+    Element mr_info_response = (Element) mr_.process(mr_info_message);
+    Element description = doc_.createElement("description");
+    Node cl = GSXML.getNodeByPath(mr_info_response, "response/service/classifierList");
+
+    Element imported_classList = (Element)doc_.importNode(cl, true);
+
+    description.appendChild(imported_classList);
+    cgi_request.appendChild(description);
+
+
+    // if there is a cl field in the cgi params, get the classifier info
+    String node = (String)params.get("cl");
+
+    if (node==null|| node.equals("")) {
+        System.out.println("no cl node selected");
+        // if there is no cl set, just output the list
+        GSXSLT.absoluteIncludePaths(style_doc, config_);
+        return transformer_.transform(stylesheet, page);       
+    }
+    
+    // get the info for the selected node
+    Element mr_query_message = doc_.createElement("message");
+    Element mr_query_request = doc_.createElement("request");
+    mr_query_message.appendChild(mr_query_request);
+
+    mr_query_request.setAttribute("type", "query");
+    mr_query_request.setAttribute("to", to);
+
+    // paramList - empty for now
+    Element paramList = doc_.createElement("paramList");
+    mr_query_request.appendChild(paramList);
+
+
+    // content - contains the classifier node, may be more than one
+    // call this resource list for now
+    Element query_content = doc_.createElement("content");
+    mr_query_request.appendChild(query_content);
+    
+    Element resource_list = doc_.createElement("resourceList");
+    Element resource = doc_.createElement("resource");
+    resource.setAttribute("name", node);
+    resource_list.appendChild(resource);
+    query_content.appendChild(resource_list);
+
+    Element mr_query_response = (Element)mr_.process(mr_query_message);
+
+    Element response = (Element)GSXML.getChildByTagName(mr_query_response, "response");
+    Node new_style = GSXML.getChildByTagName(response, "stylesheet");
+    if (new_style !=null) {
+        GSXSLT.mergeStylesheets(style_doc, (Element)new_style);
+        response.removeChild(new_style);
+    }
+    // add the response to the page data
+    page.appendChild(doc_.importNode(response, true));
+
+    GSXSLT.absoluteIncludePaths(style_doc, config_);
+    return transformer_.transform(style_doc, page);
+    }
+
+    protected String unknownBrowse(Element page, Element request, String browse_type) {
 
     return GSHTML.errorPage("unknown browse subtype: "+browse_type);